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Abstract:

A semiclassical cosmological model is considered which consists of a closed Friedmann-Robertson-Walker spacetime in the presence of a cosmological constant, which mimics the effect of an inflaton field, and a massless, non-conformally coupled quantum scalar field. We show that the back-reaction of the quantum field, which consists basically of a nonlocal term due to gravitational particle creation and a noise term induced by the quantum fluctuations of the field, are able to drive the cosmological scale factor over the barrier of the classical potential so that if the universe starts near a zero scale factor (initial singularity), it can make the transition to an exponentially expanding de Sitter phase. We compute the probability of this transition and it turns out to be comparable with the probability that the universe tunnels from “nothing” into an inflationary stage in quantum cosmology. This suggests that in the presence of matter fields the back-reaction on the spacetime should not be neglected in quantum cosmology. © 1999 The American Physical Society.

Registro:

Documento: Artículo
Título:Noise induced transitions in semiclassical cosmology
Autor:Calzetta, E.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE) and Departamento de Física, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
Departament de Física Fonamental and Institut de Física d’Altes Energies (IFAE), Universitat de Barcelona, Av. Diagonal 647, Barcelona, E-08028, Spain
Año:1999
Volumen:59
Número:8
DOI: http://dx.doi.org/10.1103/PhysRevD.59.083513
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v59_n8_p_Calzetta

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Citas:

---------- APA ----------
(1999) . Noise induced transitions in semiclassical cosmology. Physical Review D - Particles, Fields, Gravitation and Cosmology, 59(8).
http://dx.doi.org/10.1103/PhysRevD.59.083513
---------- CHICAGO ----------
Calzetta, E. "Noise induced transitions in semiclassical cosmology" . Physical Review D - Particles, Fields, Gravitation and Cosmology 59, no. 8 (1999).
http://dx.doi.org/10.1103/PhysRevD.59.083513
---------- MLA ----------
Calzetta, E. "Noise induced transitions in semiclassical cosmology" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 59, no. 8, 1999.
http://dx.doi.org/10.1103/PhysRevD.59.083513
---------- VANCOUVER ----------
Calzetta, E. Noise induced transitions in semiclassical cosmology. Phys Rev D Part Fields Gravit Cosmol. 1999;59(8).
http://dx.doi.org/10.1103/PhysRevD.59.083513